____________________ prototyping is the process of creating a solid model in a computer-controlled machine using a CAD design file.

Fill in the blank(s) with the appropriate word(s).


Rapid

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?Strain is measured in millimeters per ____.

A. ?centimeter B. ?millimeter C. ?kilogram D. ?gram

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Which type of refrigerant hose is used with an R-134a system?

A) Barrier hose B) Rigid hose C) Flexible, porous hose D) Copper type hose

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It is important to the HVACR technician to understand the changes of state of matter because:

A) NATE certification exams require a good understanding of the Periodic Table of Elements. B) The refrigerant recovery process requires a technician to know which state the matter is in to ensure that only like refrigerants are put into a recovery container. C) Technicians are required to mix refrigerants to attain proper pressures and temperatures when charging refrigeration systems. D) The cooling and heating process requires a change of state of matter in some form.

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With regard to a rectangular waveform, a transition is a change from

A) pulsating direct current to smooth direct current B) ac to dc C) dc to ac D) either dc level to the other

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